diff --git a/src/time/cds.rs b/src/time/cds.rs
index 1161a65..f6401a9 100644
--- a/src/time/cds.rs
+++ b/src/time/cds.rs
@@ -11,10 +11,9 @@ use alloc::boxed::Box;
 use chrono::Datelike;
 use core::any::Any;
 use core::fmt::Debug;
-use core::ops::Add;
+use core::ops::{Add, AddAssign};
 use core::time::Duration;
 use delegate::delegate;
-use std::ops::AddAssign;
 
 /// Base value for the preamble field for a time field parser to determine the time field type.
 pub const P_FIELD_BASE: u8 = (CcsdsTimeCodes::Cds as u8) << 4;